The Uniclife Aquarium Shipwreck Decoration Resin Sunken Ship Decor Ornament is a great way to create a natural, sea-like atmosphere in your fish tank. Made of durable resin material and colored with vivid hues, this ornament is perfect for adding fun to your life. The seven cave entry/exit holes make it easy for your fish to move around, and the flat bottom ensures that the ornament stays put in your tank. With a weight of only 4.7 ounces, this ornament is recommended for use in 5-30 gallon fish tanks or large fish bowls.